Cut the stick of butter into several thin pieces. Place in a microwave safe bowl and heat for 20 seconds. Stir to melt any chunks that remain.
In a large mixing bowl, combine sugars, salt, cinnamon, and flour. Slowly add the melted butter. The batter will form clumps while some of the dry mixture will remain at the bottom of the bowl. Don’t overmix. Set aside.
For the Cake:
Preheat oven to 325F degrees.
Grease a 12-muffin tin pan.
In an electric mixer, using a paddle attachment, mix flour, sugar, baking soda and salt.
Add softened butter and beat for a minute or so until no chunks remain.
Combine egg, yogurt, vanilla and buttermilk in an airtight container. Shake well until completely smooth. Add to the mixing bowl with the dry ingredients. Mix until just incorporated.
Add batter to prepared baking pan. Fill each cupcake about halfway full of cake batter.
Spoon in crumb topping.
Bake for 10 minutes. Turn the pan around and bake for another 11 minutes. Allow to cool. before serving.
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